i have had 4 places tell me i will be best off running 20 by 8.5 all around on my car. man....i want to run 20 by 8.5 and 20 by 10 rear. what to do????

 

The problem is that the sedan's VDC system is not designed to handle offset wheel sizes. If you have tires with a larger diameter in front or back, the VDC system may mistake this for wheel slippage, and activate the ABS breaks to "correct" the problem. You don't want that. To avoid that, your tires need to have the exact same diameter. This is best accomplished with same size tires.

With those rim sizes, I assume you're looking at something like 245/35R20 front and 285/30R20 rear. In this case, the diameter of the two tires is very, very close, but not quite exact. I do not know if this would be "close enough."

Another thing you may want to look into is replacing your VDC computer with the coupe's VDC computer. I'm not sure if this is possible, or how much it costs, I've simply heard the suggestion mentioned before. If this works, then you just need to have whichever axle contains the speed sensor to be reasonably close to the diameter of the stock 215/55R17 tires. Both sizes mentioned above are close to the stock diameter.

One other problem is that Infiniti recommends tires no wider than 225 on the front axle in order for the tires to clear the suspension components. Many people are successfully running 235's and 245's however. I imagine Infiniti is erring on the side of caution, but it's something to be aware of.

2003.5 G35 Sedan Desert Platinum/Graphite Premium/Sport/Aero/Nav/Winter

 

does anyone know where the vdc computer is located?? so theoretically avoiding the vdc thing what are the widest widths i can run on the car...i guess i will go with 8.5 up from, but what about the rears?
thanks

 

maybe it's me, but it doesn't sound like you read the post above.... you're going to have to use the same size tires on both front/rear to avoid engaging the ABS braking system. :P

 

Ryoken gives very complete answers-he's a Pooh Bah go figure.

03.5 Sedan/B. Silver/Prem/Winter/Aero/Tint/Rims
69 Chevelle Hard Top BB/4.11's/Posi

 

I have 245's all the way around, but with 45mm offset's. The front has the greatest clearance limitation's. I have about 5mm clearance between the tire and suspension arm. Going with 40mm offset would buy you more clearance from the suspension, but move you closer to the front fender lip. So 255's might work with 40mm offset, but then again they might rub on the fender lip when the suspension set's compressed for whatever reason.

BTW, you can stuff a 275 width in the rear. Their is a sedan owner here or on freshalloy that his pics of the setup, but if you don't get the offset just right, you'll rub someplace or other. I would think it would take a high offset over 40mm for the rear. Sedan and coupe offset needs are NOT the same.

Ivry 6mt sed
Injen CAI, 22" resonator
8X18 Enkei RPM2 45mm
Kumho MX 245/40
clear corners

 

"maybe it's me, but it doesn't sound like you read the post above.... you're going to have to use the same size tires on both front/rear to avoid engaging the ABS braking system. :P"

maybe it is me, but it sounds like you didn't read. i aked where the VDC is and i also said not considering in the VDC thing how wide can i go. :P

so this other person is running a wider set up on his 4 door. has he had any VDC problems that have been noted by others saying that it happens?

 

I replied to you, the creator of this thread. I'm not going to explain my position on the "rumored" effect on the sedan concerning running wider rear tires may or may not have on VDC. What you have are a bunch of people that heard something from so and so and so on. I especially liked the one I read someplace that said if you run different tread compound's, your VDC won't function right. What you will not see is a sedan driver that is running wider rears having made a post where he confirms the issue. So my post was driven to help you as best I can, not to conform to unconfirmed facts. I will let you use your own judgement, without prejudice from me.

When my rear tire's wear out, I will be running wider rears on my car. Know one thing for certain, if their is a VDC issue, I will find out about it in short order and will post accordingly.

Ivry 6mt sed
Injen CAI, 22" resonator
8X18 Enkei RPM2 45mm
Kumho MX 245/40
clear corners

 

Hey, chill out everyone. Gsedan35, I don't think he was griping at you, but at the person he quoted, and that is the person who apparently didn't read my post fully.

As for the VDC system, I was repeating heresy from older threads on this forum. I don't know if the coupe's system can be put on the sedan, or how you would go about doing it, just pointing out an avenue of research you can persue. You may want to see if your local Infiniti service tech has any helpful information -- the worst thing they can do is just say no, which may or may not be truthful.

With the standard VDC system, the only important point is tire diameter (or revolutions per mile, same basic concept). How close does it have to be to keep the VDC system happy? I don't know. What happens if the VDC system isn't happy? It will detect the smaller tires spinning faster than the larger tires, assume the wheels are slipping, and apply the brakes to those wheels (and blink the SLIP light on the dash). It shouldn't be dangerous, but will most likely cause reduced gas mileage and premature brake wear, possibly stress some other parts.

Is this for every-day driving or track use only? If it's for track use only, then you have the option of just shutting off the VDC system when you put those tires on -- you don't want VDC on the track anyway, it engages too often on tight corners. If it's for every-day driving, this is still an option, but I know I'd forget to shut it off quite often, and be half-way to work before realizing it.

2003.5 G35 Sedan Desert Platinum/Graphite Premium/Sport/Aero/Nav/Winter

 

Hey Gsedan...I did not saying anything negative about what you said??? Your info was very helpful. I am in the same boat as you...I would like to get to the bottom of this and find out if it is true or not. I would like to get a staggered set up. Gazing through the rides section I noticed quite a few sedans with a staggered set up and haven't heard any complaints, so...???? I have no clue on what to go by. Are you going to run the same width rims and just stagger the tires on your set up? I have my mind made up on which wheels to get...either 19" volk 57f pros or 20" intro forged wheels. I am going to run 245's up front and 275's in the rear. Now hopefully nothing goes wrong. To bad either of the wheels I order this week won't be here for sometime from now.
Thanks

 

I have 18x9's on the rear with a 38 offset. It makes the 245's quite happy on the back......

https://g35driver.com/rides/detailri...dx=6&vehId=182

Frank
CM Motorsports
949 453 1199

 

ronnie5 (registered)
06/04/03 10:44 PM

Hey Gsedan...I did not saying anything negative about what you said??? Your info was very helpful.

Ok, sorry, their really wasn't a way for me to know you weren't addressing me. But since you've pointed out that you wern't talking to me, I'm going to edit out my reply since their isn't a issue.

THIS BOARD NEED'S A QUOTE SYSTEM!!! All other forums have it, what just happened here could have been avoided.

Well I can't edit my 2nd post, could a moderator please edit out the first paragraph and leave only the second paragraph.
Ivry 6mt sed
Injen CAI, 22" resonator
8X18 Enkei RPM2 45mm
Kumho MX 245/40
clear corners

<P ID="edit"><FONT class="small"><EM>Edited by Gsedan35 on 06/11/03 07:20 PM.</EM></FONT></P>

 

<blockquote><font class="small">In reply to:</font><hr>

THIS BOARD NEED'S A QUOTE SYSTEM!!! All other forums have it, what just happened here could have been avoided.

<hr></blockquote>
It does. Put [ quote ] and [ /quote ] tags (no spaces, though) around your message. For other markup tags, click on the "markup in your posts" link above the form where you compose your message.

2003.5 G35 Sedan Desert Platinum/Graphite Premium/Sport/Aero/Nav/Winter